SELECT S# FROM SC ORDER BY S# WHERE COUNT(*)>3 D. SELECT S# FROM SC ORDER BY S# HAVING COUNT(*)>3 答案 B 结果二 题目 “查询选修了3门以上课程的学生的学生号”,正确的SQL语句是 A.SELECT S# FROM SC GROUP BY S# WHERE COUNT(*)>3B.SELECT S# FROM SC GROUP BY S# HAVING COUNT...
“查询选修了3门以上课程的学生的学生号”,正确的SQL语句是A.sELEcT S#FROM SC GROUP BY S#WHERE COUNT(*)>3B.SELECT s#FROM SC GROUP.BY S#HAVING COtJNT(*)>3C.sELECT S#FROM SC ORDER BY S#HAVING COUNT(*)>3D.sELECT S#FROM SC ORDER BY S#WHERE COUNT(*)>3请帮忙给出正确答案和分析,谢谢...
若要求“查询选修了3门以上课程的学生的学号”,正确的SQL语句是( ) A. SELECT sNo FROM SC GROUP BY sNo WHERE COUNT(*)> 3 B. SELECT sNo FROM SC GROUP BY sNo HAVING COUNT(*)> 3 C. SELECT sNo FROM SC ORDER BY sNo WHERE COUNT(*)> 3 D. SELECT sNo FROM SC ORDER BY sNo HAVING ...
在SQL中，SELECT语句是查询数据库中最常用的命令。它用于从一个或多个表中检索数据。例如，SELECT COUNT(course) FROM sc GROUP BY course可以用来计算每个课程的选课人数。另一个例子是SELECT AVG(age) FROM sc, s WHERE sc.sno=s.sno AND course='c4'，这条语句计算的是课程为'c4'的学生的平...
SELECT sno, count(*) FROM sc GROUP BY sno的意思是:A.查询每个课程的选课人数B.查询每个学生的选课数目C.查询选课表SC中每个学生的学号和选课数目D.以上都不对的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一
MAX和*有问题，一般用了GROUP BY后，前面的SELECT 和FROM中间只能填Cno，想想看，你GROUP BY了以后，可能那个字段有3条记录，你选了个*号，可能原表另外两个字段有5个记录，5个记录和3个记录怎么拼一起显示呢？应该是 SELECT Cno,MAX(score) FROM sc GROUP BY cno;...
查询语句中,错误的是( ) A. SELECT Sno, COUNT(*) FROM SC GROUP BY Sno B. SELECT Sno FROM SC G
SELECT sno, count(*) FROM sc GROUP BY sno的意思是: A. 查询每个课程的选课人数 B. 查询每个学生的选课数目 C. 查询选课表SC中每个学生的学号和选课数目 D. 以上都不对 相关知识点: 试题来源: 解析 C.查询选课表SC中每个学生的学号和选课数目 解析: 反馈 收藏 ...
SELECT S#,AVG(SCORE) FROM SC GROUP BY S# HAVING AVG(SCORE) >80; 导出表形式: SELECT S#,AVG_SCORE FROM (SELECT S#,AVG(SCORE) FROM SC GROUP BY S#) AS RESULT(S#,AVG_SCORE) WHERE AVG_SCORE>80; 1. 2. 3. 4. 5. 6.
1:select sno(学生的学号) from sc(学生选课表)group by sno having count（*）>1 2:select s.sno,s.name from student swhere s.sno in(select sno from score scgroup by sc.cno having sum(sc.sno)>2 )3：应为三张表；学生表A 课程表B 选修表C(cid aid bid)--没有选修任何...